Infinite yield WaitForChild() Error? [closed]

There are two questions to ask.

1.

--Script in ServerscriptService
local MarketplaceService = game:GetService("MarketplaceService")
local Players = game:GetService("Players")

local gamePassID = 0000000 -- Change this to your game pass ID

local function onPlayerAdded(player)

    local hasPass = false

    -- Check if the player already owns the game pass
    local success, message = pcall(function()
        hasPass = MarketplaceService:UserOwnsGamePassAsync(player.UserId, gamePassID)
    end)

    -- If there's an error, issue a warning and exit the function
    if not success then
        warn("Error while checking if player has pass: " .. tostring(message))
        return
    end

    if hasPass == true then
        print(player.Name .. " owns the game pass with ID " .. gamePassID)
        -- Assign this player the ability or bonus related to the game pass
        game.StarterGui.RUN.TextButton.Visible = true
    end

 end
-- Connect 'PlayerAdded' events to the 'onPlayerAdded()' function
Players.PlayerAdded:Connect(onPlayerAdded)

This script is for the "run" gamepass. This script is for outside purchases(or purchased before/ingame)

Does this script makes the button visible to all other players with people who didn't buy the gamepass?

2.

local MarketplaceService = game:GetService("MarketplaceService")
local Players = game:GetService("Players")

local gamePassID = 5923482 -- Change this to your game pass ID

local function onPlayerAdded(player)

    local hasPass = false

    -- Check if the player already owns the game pass
    local success, message = pcall(function()
        hasPass = MarketplaceService:UserOwnsGamePassAsync(player.UserId, gamePassID)
    end)

    -- If there's an error, issue a warning and exit the function
    if not success then
        warn("Error while checking if player has pass: " .. tostring(message))
        return
    end

    if hasPass == true then
        print(player.Name .. " owns the game pass with ID " .. gamePassID)
        -- Assign this player the ability or bonus related to the game pass
        local GUI = player:WaitForChild("PlayerGui")
        local RUN = GUI:WaitForChild("RUN")
        local button = RUN:WaitForChild("TextButton")
        button.Visible = true
    end

 end
-- Connect 'PlayerAdded' events to the 'onPlayerAdded()' function
Players.PlayerAdded:Connect(onPlayerAdded)

--If I use this code, Output says:
14:53:57.663 - Infinite yield possible on 'Players.S_H1234.PlayerGui:WaitForChild("RUN")'

There is ScreenGUI "RUN" in S_H1234.PlayerGui, but why will it say Infinite yield?

This script is from Official Roblox Developer Forum : Click ME